I'm not familiar with the rear end in my truck. My symptoms were seemingly identical to a problem I had with my vette. When accelerating in a turn I experienced a loud hard knock or two or three from what I think is the differential. In the vette I changed the diff fluid and included a posi-trac additive. Problem solved. Tried it with the truck and made no change. In fact shortly after that I got a horrible loud ratcheting sound even when going straight. Truck is parked now!! Axel splines maybe? Any thoughts? Thanks in advance.